def to_xml
      # av = ActionView::Base.new(Rails.configuration.view_path)
      #  av.assigns[:batch] = self
      #  av.render "in_prepaid/batch.xml.builder"
      RenderXML.new(self).render
    end
    
    class RenderXML
      def initialize(batch)
        @batch = batch
        @_xml = ::Builder::XmlMarkup.new(:target => @_xml_output, :indent => 1)
      end
      
      def render
        io = File.read(File.join(RAILS_ROOT, 'app', 'views', 'in_prepaid', 'batch.xml.builder'))
        eval(io, binding)
      end
      
      def xml
        @_xml
      end
    end